The White House said President Trump spoke with the leader of China on Monday about North Korea’s escalating weapons program and the two agreed on “maximizing pressure” on the rogue regime.

According to the readout of the talk between Trump and President Xi Jinping released by the White House, they are “committed to maximizing pressure on North Korea through vigorous enforcement of United Nations Security Council resolutions.”

The 15-member council last ​Monday​ agreed unanimously to impose sanctions against North Korea in retaliation for successfully detonating a nuclear device earlier this month​ and for its recent launch of two intercontinental ballistic missiles.​

The penalties, which China and Russia supported, place severe restrictions on President Kim Jong Un’s government to import oil and textiles.

Trump, who spoke at the UN on Monday during a meeting about reforming the world body, referred to the sanctions in a tweet on Sunday when he mocked Kim as the “Rocket Man” and suggested the penalties are taking a toll on Pyongyang, writing “Long gas lines forming in North Korea. Too bad!”

On Tuesday, Trump will address for the first time the UN General Assembly, where North Korea’s military threats that are destabilizing the region are expected to be a major part of his speech.

​North Korea’s UN diplomatic delegations also will have a front-row seat of Trump’s address. ​